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      2019年8月27日 凌晨
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              <h1 id="成果展示"><a href="#成果展示" class="headerlink" title="成果展示"></a>成果展示</h1><iframe src="https://erina.gitee.io/ilirus/CSS%E8%9B%87%E5%BD%A2%E8%BE%B9%E6%A1%86/04.html" frameborder="0" width="200" height="100"></iframe>

<blockquote>
<p><a href="https://caniuse.com/#search=clip-path" target="_blank" rel="noopener">浏览器支持</a>:</p>
<ul>
<li>Chrome 55+</li>
<li>Firefox 54+</li>
</ul>
</blockquote>
<h1 id="主要思路"><a href="#主要思路" class="headerlink" title="主要思路"></a>主要思路</h1><blockquote>
<p>使用<code>伪元素</code>实现一个大于目标元素的背景板，<br>再使用<code>clip-path</code>将其裁剪到只剩上/下/左/右一个边,<br>再使用<code>animation</code>实现动画效果。</p>
</blockquote>
<h1 id="实现过程"><a href="#实现过程" class="headerlink" title="实现过程"></a>实现过程</h1><p>写一个普通的<code>button</code><br><pre><code class="hljs html"><span class="hljs-meta">&lt;!DOCTYPE <span class="hljs-meta-keyword">html</span>&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">html</span>&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">head</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-name">meta</span> <span class="hljs-attr">charset</span>=<span class="hljs-string">"UTF-8"</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-name">style</span>&gt;</span><span class="css">
  <span class="hljs-selector-class">.content</span> &#123;
    <span class="hljs-attribute">width</span>: <span class="hljs-number">180px</span>;
    <span class="hljs-attribute">height</span>: <span class="hljs-number">64px</span>;
    <span class="hljs-attribute">margin</span>: <span class="hljs-number">0</span>;
    <span class="hljs-attribute">padding</span>: <span class="hljs-number">0</span>;
    <span class="hljs-attribute">border</span>: none;
    <span class="hljs-attribute">background</span>: transparent;
    <span class="hljs-attribute">position</span>: relative;
    <span class="hljs-attribute">font-size</span>: <span class="hljs-number">24px</span>;
  &#125;
  </span><span class="hljs-tag">&lt;/<span class="hljs-name">style</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">head</span>&gt;</span>
<span class="hljs-tag">&lt;<span class="hljs-name">body</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-name">button</span> <span class="hljs-attr">class</span>=<span class="hljs-string">"content"</span>&gt;</span>我是内容<span class="hljs-tag">&lt;/<span class="hljs-name">button</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">body</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">html</span>&gt;</span></code></pre></p>
<p>加上<code>::before</code><br><pre><code class="hljs css"><span class="hljs-selector-class">.content</span><span class="hljs-selector-pseudo">::before</span> &#123;
  <span class="hljs-attribute">content</span>: <span class="hljs-string">''</span>;
  <span class="hljs-attribute">position</span>: absolute;
  <span class="hljs-attribute">top</span>: -<span class="hljs-number">2px</span>; <span class="hljs-attribute">bottom</span>: -<span class="hljs-number">2px</span>;
  <span class="hljs-attribute">left</span>: -<span class="hljs-number">2px</span>; <span class="hljs-attribute">right</span>: -<span class="hljs-number">2px</span>;
  <span class="hljs-attribute">background</span>: olivedrab;
  <span class="hljs-attribute">border</span>: <span class="hljs-number">2px</span> solid olive;
  <span class="hljs-attribute">z-index</span>: -<span class="hljs-number">1</span>;
&#125;</code></pre></p>
<iframe src="https://erina.gitee.io/ilirus/CSS%E8%9B%87%E5%BD%A2%E8%BE%B9%E6%A1%86/01.html" frameborder="0" width="200" height="100"></iframe>

<p>使用<code>clip-path</code>裁剪<br><pre><code class="hljs css"><span class="hljs-selector-class">.content</span><span class="hljs-selector-pseudo">::before</span> &#123;
  <span class="hljs-comment">/* 上 */</span>
  <span class="hljs-attribute">clip-path</span>: <span class="hljs-built_in">inset</span>(<span class="hljs-number">0</span> <span class="hljs-number">0</span> calc(<span class="hljs-number">100%</span> - <span class="hljs-number">2px</span>) <span class="hljs-number">0</span>);
  <span class="hljs-comment">/* 右 */</span>
  <span class="hljs-attribute">clip-path</span>: <span class="hljs-built_in">inset</span>(<span class="hljs-number">0</span> <span class="hljs-number">0</span> <span class="hljs-number">0</span> calc(<span class="hljs-number">100%</span> - <span class="hljs-number">2px</span>));
  <span class="hljs-comment">/* 下 */</span>
  <span class="hljs-attribute">clip-path</span>: <span class="hljs-built_in">inset</span>(calc(<span class="hljs-number">100%</span> - <span class="hljs-number">2px</span>) <span class="hljs-number">0</span> <span class="hljs-number">0</span> <span class="hljs-number">0</span>);
  <span class="hljs-comment">/* 左 */</span>
  <span class="hljs-attribute">clip-path</span>: <span class="hljs-built_in">inset</span>(<span class="hljs-number">0</span> calc(<span class="hljs-number">100%</span> - <span class="hljs-number">2px</span>) <span class="hljs-number">0</span> <span class="hljs-number">0</span>);
&#125;</code></pre></p>
<iframe src="https://erina.gitee.io/ilirus/CSS%E8%9B%87%E5%BD%A2%E8%BE%B9%E6%A1%86/02.html" frameborder="0" width="200" height="300"></iframe>

<a id="more"></a>
<p>使用<code>animation</code>实现动画效果<br><pre><code class="hljs css"><span class="hljs-selector-class">.content</span><span class="hljs-selector-pseudo">::before</span> &#123;
  <span class="hljs-attribute">content</span>: <span class="hljs-string">''</span>;
  <span class="hljs-attribute">position</span>: absolute;
  <span class="hljs-attribute">top</span>: -<span class="hljs-number">2px</span>; <span class="hljs-attribute">bottom</span>: -<span class="hljs-number">2px</span>;
  <span class="hljs-attribute">left</span>: -<span class="hljs-number">2px</span>; <span class="hljs-attribute">right</span>: -<span class="hljs-number">2px</span>;
  <span class="hljs-attribute">background</span>: olivedrab;
  <span class="hljs-attribute">border</span>: <span class="hljs-number">2px</span> solid olive;
  <span class="hljs-attribute">z-index</span>: -<span class="hljs-number">1</span>;
  <span class="hljs-attribute">animation</span>: snake <span class="hljs-number">10s</span> linear infinite;
&#125;

<span class="hljs-keyword">@keyframes</span> snake &#123;
  0%, 100% &#123;
    <span class="hljs-attribute">clip-path</span>: <span class="hljs-built_in">inset</span>(<span class="hljs-number">0</span> <span class="hljs-number">0</span> calc(<span class="hljs-number">100%</span> - <span class="hljs-number">2px</span>) <span class="hljs-number">0</span>);
  &#125;
  25%&#123;
    <span class="hljs-attribute">clip-path</span>: <span class="hljs-built_in">inset</span>(<span class="hljs-number">0</span> <span class="hljs-number">0</span> <span class="hljs-number">0</span> calc(<span class="hljs-number">100%</span> - <span class="hljs-number">2px</span>));
  &#125;
  50%&#123;
    <span class="hljs-attribute">clip-path</span>: <span class="hljs-built_in">inset</span>(calc(<span class="hljs-number">100%</span> - <span class="hljs-number">2px</span>) <span class="hljs-number">0</span> <span class="hljs-number">0</span> <span class="hljs-number">0</span>);
  &#125;
  75%&#123;
    <span class="hljs-attribute">clip-path</span>: <span class="hljs-built_in">inset</span>(<span class="hljs-number">0</span> calc(<span class="hljs-number">100%</span> - <span class="hljs-number">2px</span>) <span class="hljs-number">0</span> <span class="hljs-number">0</span>);
  &#125;
&#125;</code></pre></p>
<iframe src="https://erina.gitee.io/ilirus/CSS%E8%9B%87%E5%BD%A2%E8%BE%B9%E6%A1%86/03.html" frameborder="0" width="200" height="100"></iframe>


<p>完善CSS代码<br><pre><code class="hljs css"><span class="hljs-selector-class">.content</span> &#123;
  <span class="hljs-attribute">width</span>: <span class="hljs-number">180px</span>;
  <span class="hljs-attribute">height</span>: <span class="hljs-number">64px</span>;
  <span class="hljs-attribute">margin</span>: <span class="hljs-number">0</span>;
  <span class="hljs-attribute">padding</span>: <span class="hljs-number">0</span>;
  <span class="hljs-attribute">border</span>: none;
  <span class="hljs-attribute">background</span>: transparent;
  <span class="hljs-attribute">position</span>: relative;
  <span class="hljs-attribute">font-size</span>: <span class="hljs-number">24px</span>;
&#125;
<span class="hljs-selector-class">.content</span><span class="hljs-selector-pseudo">::before</span>, <span class="hljs-selector-class">.content</span><span class="hljs-selector-pseudo">::after</span> &#123;
  <span class="hljs-attribute">content</span>: <span class="hljs-string">''</span>;
  <span class="hljs-attribute">position</span>: absolute;
  <span class="hljs-attribute">top</span>: -<span class="hljs-number">2px</span>; <span class="hljs-attribute">bottom</span>: -<span class="hljs-number">2px</span>;
  <span class="hljs-attribute">left</span>: -<span class="hljs-number">2px</span>; <span class="hljs-attribute">right</span>: -<span class="hljs-number">2px</span>;
&#125;
<span class="hljs-selector-class">.content</span><span class="hljs-selector-pseudo">::before</span> &#123;
  <span class="hljs-attribute">border</span>: <span class="hljs-number">2px</span> solid olive;
  <span class="hljs-attribute">animation</span>: snake <span class="hljs-number">4s</span> linear infinite;
&#125;
<span class="hljs-selector-class">.content</span><span class="hljs-selector-pseudo">::after</span> &#123;
  <span class="hljs-attribute">border</span>: <span class="hljs-number">2px</span> solid plum;
  <span class="hljs-attribute">animation</span>: snake <span class="hljs-number">4s</span> linear infinite;
  <span class="hljs-attribute">animation-delay</span>: -<span class="hljs-number">2s</span>;
&#125;

<span class="hljs-keyword">@keyframes</span> snake &#123;
  0%, 100% &#123;
    <span class="hljs-attribute">clip-path</span>: <span class="hljs-built_in">inset</span>(<span class="hljs-number">0</span> <span class="hljs-number">0</span> calc(<span class="hljs-number">100%</span> - <span class="hljs-number">2px</span>) <span class="hljs-number">0</span>);
  &#125;
  25%&#123;
    <span class="hljs-attribute">clip-path</span>: <span class="hljs-built_in">inset</span>(<span class="hljs-number">0</span> <span class="hljs-number">0</span> <span class="hljs-number">0</span> calc(<span class="hljs-number">100%</span> - <span class="hljs-number">2px</span>));
  &#125;
  50%&#123;
    <span class="hljs-attribute">clip-path</span>: <span class="hljs-built_in">inset</span>(calc(<span class="hljs-number">100%</span> - <span class="hljs-number">2px</span>) <span class="hljs-number">0</span> <span class="hljs-number">0</span> <span class="hljs-number">0</span>);
  &#125;
  75%&#123;
    <span class="hljs-attribute">clip-path</span>: <span class="hljs-built_in">inset</span>(<span class="hljs-number">0</span> calc(<span class="hljs-number">100%</span> - <span class="hljs-number">2px</span>) <span class="hljs-number">0</span> <span class="hljs-number">0</span>);
  &#125;
&#125;</code></pre></p>
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